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annotate cos/kernel/kernel.c @ 32:3a6a9b929db0

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Added initial ramdisk and some virtual file system functions
author windel
date Fri, 13 Jan 2012 18:18:17 +0100
parents 88590c42320f
children d8185ddb6c7b
rev   line source
31
88590c42320f Changed interrupt handler
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2 #include "kernel.h"
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4 static void testMalloc()
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5 {
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6 char *a, *b;
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7
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8 printf("Testing malloc\n");
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9 a = kmalloc(100);
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10 printf("Got a at %x\n", a);
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11 a[0] = 'A';
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12 b = kmalloc(22);
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13 printf("Got b at %x\n", b);
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14 b[0] = 'B';
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15 kfree(a);
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16 }
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18 multiboot_info_t *multiboot_info = 0; // Set by startup code.
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20 /* This routine initializes the kernel.
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21 * We are left here in 64-bit long mode with the first 6 MB identity mapped.
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22 * */
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23 void kmain()
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24 {
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25 init_screen();
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26 setupIDT();
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28 uint64_t available_memory = 0;
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30 /* Display memory information from multiboot header */
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31 if ((multiboot_info->flags & (1<<6)) == (1<<6))
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32 {
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33 multiboot_memory_map_t *mmap;
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34 for (mmap = (multiboot_memory_map_t*)(uint64_t)multiboot_info->mmap_addr;
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35 (uint64_t)mmap < multiboot_info->mmap_addr + multiboot_info->mmap_length;
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36 mmap = (multiboot_memory_map_t*) ( (uint64_t)mmap + mmap->size + sizeof(mmap->size)) )
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37 {
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38 printf("size: %d, start: 0x%x, length=0x%x, type=%d\n", mmap->size, mmap->base, mmap->length, mmap->type);
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39
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40 if ( (mmap->type == 1) && (mmap->base == 0x100000) )
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41 {
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42 available_memory = mmap->length;
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43 }
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44 }
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45 }
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46
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47 printf("Running with %d MB ram\n", available_memory / 1000000);
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48
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49 fs_node_t *fs_root = 0;
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50
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51 if ( (multiboot_info->flags & (1<<3)) == (1<<3))
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52 {
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53 printf("Mod count: %d\n", multiboot_info->mods_count);
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54 uint64_t i;
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55 multiboot_module_t *mod;
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56 for (i=0, mod=(multiboot_module_t*)(uint64_t)multiboot_info->mods_addr; i<multiboot_info->mods_count; i++, mod++)
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57 {
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58 printf("Mod start: %x, end: %x\n", mod->mod_start, mod->mod_end);
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59 if (i == 0)
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60 {
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61 uint64_t ramdisk_location = ((uint32_t*)((uint64_t)multiboot_info->mods_addr))[0];
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62 fs_root = initialize_initrd(ramdisk_location);
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63 }
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64 }
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65 }
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66
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67 if (fs_root != 0)
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68 {
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69 fs_dirent_t *node = 0;
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70 int i = 0;
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71 while ( (node = readdir_fs(fs_root, i)) != 0)
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72 {
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73
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74 }
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75 }
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76
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77 // TODO: Make sure that placement malloc does not overwrite the ramdisk.
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78 printf("Mod size: ");
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79
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80 // Assume first 16MB:
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81 // TODO: get size from grub
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82 init_memory(0x1000000);
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83
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84 // TODO: make below a user space program!
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85 printf("Welcome!\n");
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88 while (1==1)
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89 {
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90 char buffer[70];
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91 printf(">");
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92 getline(buffer, 70);
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93 // TODO: interpret this line with python :)
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94 printf("\n");
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95 if (buffer[0] == 'x')
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96 {
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97 printf("System time in ms: %d\n", getTimeMS());
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98 }
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99 if (buffer[0] == 't')
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100 {
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101 testMalloc();
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102 }
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103 if ( strncmp(buffer, "help", 4))
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104 {
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105 printf("Help\n Try one of these commands:\n");
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106 printf(" x: print system time in ms\n");
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107 printf(" r: reboot\n");
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108 printf(" t: test\n");
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109 printf(" b: break\n");
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110 }
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111 if (strncmp(buffer, "r", 1))
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112 {
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113 reboot();
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114 }
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115 if (strncmp(buffer, "b", 1))
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116 {
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117 magicBochsBreak();
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118 }
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119 }
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120 }
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